Please help with market value 1991-92 Pro Set Prototypes Magic Johnson PSA 10, your thoughts

Hello to all! Any idea of a market value on a 1991-92 Pro Set Prototypes Magic Johnson PSA 10?? What kind of price should I pay for one? I think $375 is to high? For those who don't know, the set was never produced, just some prototypes out there. There are PSA 10 and BGS 9.5 both at pop count of 6. Any ideas of what I should pay? I think $285 is more then high enough, but I could be wrong. Who knows maybe $100 is high enough...... Thanks for the help.
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However, I would say if your willing to pay $285...and the person wants $375..there seems to be some wiggle room between you two. The prices don't seem that much different for what the card is.
I am also going to guess it is a pop 1 in PSA 10? People tend to give numbers that favor themselves. Not really sure if its combined population means much...other then a gem grade isnt that hard to get.
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.